3790Test1FreeEndAnswers

3790Test1FreeEndAnswers - Posner and Snyder proposed an...

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Posner and Snyder proposed an idea of a 'moveable filter', which can take place  at various stages of processing based on the observer's needs. Selection can be  based on physical (for example pitch, loudness, or location) or semantic (i.e.  message content) properties, but found that semantic selection requires greater  attentional resources than physical selection, thus giving rise to the multimode  model of attention. To figure out when selection occurs, scientists used an event- related potential technique which recorded electrical activity that occurred when a  stimulus was presented. They noted a very rapid change in electrical activity,  suggesting that selection was happening early on in response to perceptual  characteristics, while other studies showed slower electrical activity, suggesting  late selection based on task relevance and possibly semantic features. In Issue 1 of Taking Sides, the question asked is “are the mind and brain the 
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3790Test1FreeEndAnswers - Posner and Snyder proposed an...

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